From maths to history, the world logs on to YouTube for lessons from Salman Khan
US President Donald J. Trump is expected to meet his Russian counterpart, Vladimir Putin, at the Group of Twenty (G20) summit in Buenos Aires later this week. Is that a good idea in light of Russia’s latest aggression toward Ukraine and the somewhat stymied success of past meetings between the two leaders? In an interview with The Washington Post , Trump left open the possibility that he might, after all, cancel the meeting over the incident in the Kerch Strait. “Maybe I won’t even have the meeting,” he said.